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10:30 a.m.: A Coke

Why?
You could be craving the caffeine. The coffee or soda you drank on the way to work is wearing off, and you want another hit to get your energy level back up to what feels like normal.

Give in or Fight It?
Fight it. Swear off the regular soda and opt for the caffeine-free diet variety. "Caffeine gives you a false sense of energy because it doesn't give your body any real fuel to burn," says Lynn Grieger, R.D., C.D.E., a Vermont-based nutritionist. If you switch to caffeine-free soda, not only will you break the caffeine/craving connection, but you probably won't even notice a difference in the taste. In a study from Johns Hopkins University, researchers found that fewer than 10 percent of people were able to tell the difference between regular and caffeine-free soft drinks.